26 6390-009-002 REV D www.stryker.com
Troubleshooting
Trolley LEDs (Continued)
b. Check that the return spring on the link is in good condition.
7. Remove the trolley covers. Check the connection of the trolley position sensor (TPS) cable (6390-001-361). If
necessary, replace the trolley position sensor (TPS) (6390-001-361).
8. Check the connection of the trolley main cable (6390-001-391) to the control board assembly (6390-101-014). If
necessary, replace the control board assembly (6390-101-014).
9. Check the connection of the trolley LED cables (6390-001-396). If necessary, replace each of the trolley LEDs
(6390-001-396).
10. Replace the trolley main cable (6390-001-391).
Cot release button does not unlock the cot from the trolley
1. Confirm that both the cot and the trolley have power, that there are no errors, and that both are operational
independently.
2. Make sure that the cot release handles on the trolley are able to release the cot from Power-LOAD.
3. Confirm that communication exists between the cot and Power-LOAD by lifting the cot using the cot controls.
4. Press the release button on the second switch. If this works, the issue is with the first switch or there is a bad
connection in the cot.
5. In a quiet area, press the release button and listen for a clicking sound at the head end patient left side of the trolley.
You may need to push the button twice if the cot is asleep.
6. If there is a sound, the problem is likely a broken part in the actuator assembly or an improperly installed actuator
assembly (6390-001-478).
7. If there is no sound, remove the trolley top and the patient left side covers.
a. Confirm that the connection of the actuator (6390-001-478) to the circuit board is good and the contacts
appear to be in good condition.
b. Confirm that the connection of the trolley main cable (6390-001-391) to the control board assembly (6390-101-
014) is good, the connector screws are tight, and the contacts appear to be in good condition.
c. Test Power-LOAD with a new actuator (6390-001-478).
d. Test Power-LOAD with a new control board assembly (6390-101-014).
Trolley release handles
Trolley release handles do not release the cot from the trolley.
1. Confirm that the system is in the loading position with the cot wheels on the ground and the head section locked into
the trolley.
2. Confirm that the lifting arms are in the full down position.
3. Are the release handles on the trolley free to rotate (they should rotate about 20 degrees)?
4. If yes:
a. Inspect the release handle mechanism. Pay particular attention to the activation cams (6390-001-329).
b. Inspect the trolley latches (6390-001-318 and 6390-001-319).
5. If no:
a. Remove the trolley covers.
b. In the mechanism in the center of the trolley at the head end, check the trolley arm (6390-001-334) or its return
spring. Check to see if the spring is broken or jammed by debris.
c. Make sure that the trolley arm mechanism (6390-001-045) in the trolley is not jammed.
d. Make sure that the trolley latches (6390-001-318 and 6390-001–319) are not stuck or broken.
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